Improvement in augers



H. L; SHALER. Auger.

No.198,857. Patented .Ian.1,1878` d. PETERS, PHOTOJLITHUGAPNER, WASHINGTON. Dv CV INVENTDR UNITED STATES PATENT OEEICE.

HENRY L. SHALER, OF DEEP RIVER, CONNECTICUT.

IMPROVEMENT IN AUGERS.

Specification forming part of Letters Patent No. 198,857, dated January l, 1878 application iiled November 2l, 1877.

To all whom it may concern Be it known that I, HENRY L. SHALER, of Deep River, in the county of Middlesex and State of Connecticut, have invented a newand valuable Improvement in Spur-Auger Bits; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, and to the letters and figures of reference marked thereon.

Figure l of the drawings is a representation of a side elevation of my invention. Fig. 2 is an end view of the same. Fig. 3 is a'broken section of the spur.

This invention has relation to spur-angers; and the object thereof is to make the spur to act more eiiectually as a guide to the auger and add to its durability without interfering with the usual office as a spur or retarding the auger, and also rendering the same to be more l easily sharpened by means of extending it on a helix and giving the inside a concave, as shown in the drawings and hereinafter described in the specification.

In the accompanying drawings, Arepresents a double-twist auger, and B is a spurV made solid with the head thereof, and concave in form, as shown at a. The spur is extended to form a bearing and guide to the auger and to increaseits durability, and has a pitch about vequal to the pitch of the screw, or as nearly to it as will best adapt it for, and make it the most serviceable in, boring, and allow the point or front to act chieiiy as the spur or cutter. The spurmay be made only the practical height from the floor-lips to secure the best results in boringthat is, little allowance need be Lmade for the reduction of its height by sharpening, as the wear by that process is mostly on the front, and does not reduce its height, as in ordinary cases.

By an auger constructed according to my forth.

In testimony that I claim the above I have hereunto subscribed my name in the presence of two witnesses.

HENRY L. SHALER.

Witnesses:

S. L. SELDEN, GrDEoN PARKER. 

